I just watched the newly released clips and the 'interview' with Kaz on youtube.
I think Sony realize that they don't need GT for console sales and are happy to let Kaz show off the technical side of the PS4, instead of previously where GT had more of an influence on console sales.
The big wigs @ Sony aren't going to be hardcore sim racers, they're going to look at the situation alot more generally. They know games like PCars and AC will partially fill a gap for the more serious online racers, while games like Driveclub etc cater for more basic / offline needs. The PS4 has sold well and they still have the big games (FIFA, Battlefield etc) doing well, I'm willing to bet they're not bothered what Kaz releases, aslong as it shows off the capabilities of the console.
GT is still great clickbait (Marketing / PR), they won't care about sounds, number of cars / tracks etc, they'll care more about VR and 4k etc etc getting exposure.
I think both Sony and Kaz will be alot happier with a relationship like that compared to one where Sony are reliant upon Kaz and Kaz feels pressured by Sony.
They still have GT Academy which is great PR and now they have the FIA solely on their consoles too.
I don't think any of them care that a 'full' GT which is reliably playable (online, as it's meant to be ((not running a 3/4 full lobby with no mics to get some kind of online reliability)) has been waited on for 10 years (or however long it's been).
In that time a whole new generation of gamers have been born or grown into video games, in their eyes this will help compensate for the GT fans who walked away owing to GT5 or 6.
Until or if (what is effectively) 'GT7' (i.e. a full working game like GT1-4) actually lands on the shop shelves, we all might aswell get used to the fact that those days are long gone and no amount of bitchin, hoping, whining or speculation is going to change anything..